//
// Created by user on 2022/1/14.
//
#include <iostream>
#include <vector>
using namespace std;

void reverseString(vector<char>& s) {
    if(s.size()==1){return;}

    int left = 0;
    unsigned int right = s.size()-1;
    while (left<right){
        swap(s[left], s[right]);
        left++;
        right--;
    }
}
